Im in the process of getting my dual 10" Type Rs installed. I used to have two 12" Type Rs in a sealed box, but they were too big to fit under my rear seats. So I downsized in size but not quality.
I am currently running a single 10 (Second is on backorder, damn you alpine!) and it hits just as hard as my 12s together. Can't wait to rock both. These redesigned alpines are brand new this year with 20% decrease in depth. They are worth it
FoxAcoustics would be your best bet, I got my box from an Audio store up here. You will need to take your underseat cargo racks out and also add seat risers. Should all come in your kit. With my box all I had to do was remove the cargo floor.